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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 22 — Aug. 1, 2007
  • pp: 4923–4931

Servo control of an optical trap

Kurt D. Wulff, Daniel G. Cole, and Robert L. Clark  »View Author Affiliations

Applied Optics, Vol. 46, Issue 22, pp. 4923-4931 (2007)

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A versatile optical trap has been constructed to control the position of trapped objects and ultimately to apply specified forces using feedback control. While the design, development, and use of optical traps has been extensive and feedback control has played a critical role in pushing the state of the art, few comprehensive examinations of feedback control of optical traps have been undertaken. Furthermore, as the requirements are pushed to ever smaller distances and forces, the performance of optical traps reaches limits. It is well understood that feedback control can result in both positive and negative effects in controlled systems. We give an analysis of the trapping limits as well as introducing an optical trap with a feedback control scheme that dramatically improves an optical trap's sensitivity at low frequencies.

© 2007 Optical Society of America

OCIS Codes
(110.0180) Imaging systems : Microscopy
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(140.7010) Lasers and laser optics : Laser trapping

ToC Category:
Other Areas of Optics

Original Manuscript: February 7, 2007
Revised Manuscript: April 27, 2007
Manuscript Accepted: May 1, 2007
Published: July 3, 2007

Virtual Issues
Vol. 2, Iss. 9 Virtual Journal for Biomedical Optics

Kurt D. Wulff, Daniel G. Cole, and Robert L. Clark, "Servo control of an optical trap," Appl. Opt. 46, 4923-4931 (2007)

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